fix(domain,infrastructure,web-server,app-tauri,frontend): TUI native noire — route PTY explicite et replay du scrollback pré-attach sans perte — #360 (QA verte)

crates/domain/src/ports.rs

@@ -1749,6 +1749,26 @@ pub trait PtyPort: Send + Sync {
     /// [`PtyError`] if the handle is unknown.
     fn subscribe_output(&self, handle: &PtyHandle) -> Result<OutputStream, PtyError>;
 
+    /// Atomically snapshots the retained output and subscribes to future chunks.
+    ///
+    /// Presentation adapters use this when they first attach a view after spawn:
+    /// bytes produced before the channel was ready are returned in the snapshot,
+    /// while bytes produced afterwards enter the stream exactly once. Concrete
+    /// adapters should override this operation when snapshot/subscription share
+    /// a synchronization boundary. The default keeps existing port adapters
+    /// source-compatible, but cannot close a race between the two operations.
+    ///
+    /// # Errors
+    /// [`PtyError`] if the handle is unknown.
+    fn subscribe_output_with_scrollback(
+        &self,
+        handle: &PtyHandle,
+    ) -> Result<(Vec<u8>, OutputStream), PtyError> {
+        let scrollback = self.scrollback(handle)?;
+        let stream = self.subscribe_output(handle)?;
+        Ok((scrollback, stream))
+    }
+
     /// Returns the recent output retained for the session (a bounded scrollback
     /// ring buffer, the most recent bytes). Used to repaint a view that
     /// re-attaches to a live PTY so the terminal isn't blank.